重组竹顺纹局部承压承载力试验研究

Experiment on partial compression bearing capacity parallel to grain of parallel strand bamboo

为了解重组竹在顺纹方向局部受压时的力学性能,设计了5组共40个试件,按照5种不同工况进行顺纹轴向承压试验,采用位移控制法加载至构件破坏,得到每组试件局部承压时的平均极限承载力,在试验的基础上,绘制每组试件的荷载-位移曲线。结果表明,重组竹顺纹局部承压承载力比较稳定,其最大变异系数为4.19%,承压区周围的工况对构件的承载力和破坏特征有显著的影响,增加围压区的数量有利于提高试件顺纹局部承压承载力,并且提高了试件的延性和抗压刚度。根据试验结果和内力分析,给出顺纹局部承压承载力的理论计算公式,其计算结果与试验结果吻合较好。

To research the mechanical performance of parallel strand bamboo(PSB)under partial compression parallel to grain,5groups of40specimens were tested with5differenct working conditions.The loading method of controlling displacement was used in the test up to failure of specimen,the average ultimate bearing capacity of each group of specimen was obtained and the loading-displacement curve of each group specimen was performed.The results showed that the ultimate bearing capacity of parallel strand bamboo under partial compression parallel to grain is stable,and the biggest variable coefficient of ultimate bearing capacity of each group of specimens is only4.19%.The working condition around the compressive PSB block has significant impact on the bearing capacity and failure mode,the increasing in quantity of confining pressure face is beneficial to improve in bearing capacity,compressive stiffness and ductility of specimen under partial loading parallel to grain.According to the testing result and interior mechanical analysis,the theoretical equation of partial compression parallel to grain of was proposed and the calculated results were in good agreemeet with the experimental results.